Photos: On the ground look at crisis in Ukraine
In the biggest confrontation between Moscow and the West since the Cold War, Russian forces have entered Ukraine after ally president Viktor Yanukovich fled his post after weeks of unrest. Ukraine officials have asked NATO for assistance, and the White House has called Russia's move a "breach of international law."
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An armored personnel carrier is seen near a barricade around the state security service building in Slaviansk on April 23.